JP7112640B2 - brush cutting saw - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush cutter chipped saw that is attached to a brush cutter and used for cutting weeds and miscellaneous trees (such as plants).

Conventionally, a brush cutting saw is disclosed in Patent Document 1, for example. This tipped saw has a mounting hole for a brush cutter formed in the center of a disk-shaped base metal, and carbide tips are fixed to a large number of tip fixing portions formed on the outer peripheral edge of the base metal. there is By activating the engine of the brush cutter while the tipped saw is attached to the tip of the working rod (rotation transmission shaft) of the brush cutter, the tipped saw rotates at a predetermined number of revolutions, and the tip cuts grass and trees. (disconnected).

JP 2011-254794 A

However, in such a chip saw, during mowing work, pebbles, sand, mud, cut vegetation, etc. on the ground, or damaged vegetation, etc. Chips and the like are likely to fly up (bounce off) and become scattered objects. In particular, when it is attempted to cut the roots of plants, etc., as much as possible, the chips are likely to come into direct contact with the ground and scatter, which is undesirable in terms of safety in the cutting work, and improvements are desired. It is the actual situation.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and its object is to provide a plate having a circular outer diameter that can suppress direct contact of the tip with the ground. To provide a brush cutting tipped saw capable of sufficiently enhancing the safety during brush cutting work by integrally arranging it with a blade.

In order to achieve this object, according to the present invention, a large number of chip fixing portions are formed on the outer peripheral edge of a disk-shaped base metal, and chips are respectively fixed to the chip fixing portions. In a brush cutter tipped saw in which a brush cutter is mounted on a brush cutter mounting surface, the base metal includes a mounting flat portion having a brush cutter mounting hole formed therein, and an outer peripheral side of the mounting flat portion on the side of the brush cutter. a stepped portion protruding in an inclined state toward the brush cutter mounting surface side to form a substantially dish-shaped recess portion that is circular in surface view; A cutting edge flat portion extending substantially parallel to the mounting flat portion is provided on the side opposite to the bush cutter mounting surface of the base metal and on the outer peripheral side of the bush cutter mounting hole with a predetermined dimension. and having a predetermined gap between it and the base metal at least on the tip side thereof, and having a circular outer peripheral surface over the entire area .

According to the second aspect of the invention, a large number of tip-fixing portions are formed on the outer peripheral edge of the disk-shaped base metal, and the tips are fixed to the tip-fixing portions, respectively, so as to be attached to the brush cutter mounting surface. In a brush cutter tipped saw to which a brush cutter is attached via a bolt, the base metal includes a flat mounting portion having a mounting hole for the brush cutter, and an outer peripheral side of the flat mounting portion inclined toward the brush cutter. a stepped portion protruding from the brush cutter mounting surface side to form a substantially dish-shaped recess portion that is circular in surface view; and a blade tip flat portion extending substantially parallel to the outer peripheral edge of the bolt protection cover for protecting the head portion of the mounting bolt. (1) is characterized in that a circular plate body having a predetermined gap from the base metal and having a flat outer peripheral surface is integrally arranged.

Further, the invention according to claim 3 is characterized in that the plate body is subjected to measures for weight reduction by means of its material, thickness or formation of lightening holes.

According to the first and second aspects of the present invention, the bolt protects the bush cutter mounting hole on the side opposite to the brush cutter mounting surface (rear surface) of the base metal, and protects the outer peripheral side of the bush cutter mounting hole or the head of the mounting bolt. Since the outer peripheral edge of the protective cover is integrally provided with a circular plate having an outer diameter smaller than the outer diameter of the base metal by a predetermined dimension and having a gap between it and the base metal at least on the tip side thereof, A circular plate with a smaller diameter than the base metal is positioned on the ground side of the tip located on the outermost side of the base metal, and the plate is earlier than the tip (base metal) during weeding work. By contacting the ground, it is possible to greatly suppress the scattering of debris on the ground caused by the chips, and to sufficiently improve the safety of mowing work.

In addition, since the base metal has a mounting flat portion, a stepped portion, and a flat cutting edge portion, and the plate body is arranged at the outer peripheral side end of the flat mounting portion substantially parallel to the flat cutting edge portion, the mounting flatness at the center position It is possible to effectively use the bolt protection cover disposed on the part and the mounting flat part, and to cover substantially the entire area of the base metal on the side opposite to the mounting surface of the brush cutter with the plate body, so that the tip does not directly contact the ground. While further suppressing the scattering, it is possible to reliably prevent the scattered matter from scattering in the direction of the operator.

Further, according to the third aspect of the invention, in addition to the effect of the first or second aspect of the invention, the plate body is made lighter by its material, thickness or formation of lightening holes. Therefore, the weight of the plate itself can be reduced by using a light-weight metal plate or a hard resin plate having an appropriate thickness, or by providing a plurality of light-weight holes in the plate. It is possible to prevent deterioration of the workability of the wiping operation.

FIG. 1 is a rear view showing an embodiment of a brush cutting tipped saw according to the present invention; Arrow view along the AA line of the same (a) is a plan view of the same plate, and (b) is an arrow view along the BB line of (a) A diagram showing the state of attachment to the bush cutter

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated in detail based on drawing.
1 to 4 show an embodiment of a brush cutting tipped saw according to the present invention. FIG. 1 shows a diagram of a tipped saw 1 (referred to as a tipped saw 1) for cutting brushes of the present invention, viewed from the back side opposite to the mounting surface of the brush cutter. As shown in FIGS. 1 and 2, the tipped saw 1 has a disk-shaped base 2 in which a large number of lightening holes 3 are formed. mounting hole 4 is formed.

The base metal 2 is formed with a mounting flat portion 2a having a predetermined width on the outer peripheral side of the mounting hole 4, and the outer peripheral side of the mounting flat portion 2a is heightened toward the surface side of the base metal 2 (upward in FIG. 2). A stepped portion 2b having a length h1 and protruding in an inclined state is formed, and a blade edge flat portion 2c is formed on the outer peripheral side of the stepped portion 2b. At this time, since the mounting flat portion 2a and the cutting edge flat portion 2c are formed parallel to each other, the direction of orientation of the chip 6 as the cutting edge (projecting direction to the outside) and the mounting flat portion 2a are parallel (a plane in substantially the same direction). ) is set to be

As a result, the base metal 2 is formed with a generally dish-shaped depression 8 that is circular in surface view on the bush cutter mounting surface 7 side due to the stepped portion 2b. The inner diameter of the recessed portion 8 of the base metal 2, the height dimension h1 of the stepped portion 2b, and the like are set to dimensions that do not interfere with attachment to the bush cutter 5, which will be described later. At the tip of the cutting edge flat portion 2c, which is the outer peripheral edge of the base metal 2, a large number of blade chambers (galettes) 9 and tip fixing portions 10 (see FIG. 1) are formed at regular intervals. , the tip 6 made of cemented carbide is fixed by brazing.

A plate member 12 is provided at the end of the rear surface (anti-brushcutter mounting surface 7) on the outer peripheral side of the mounting flat portion 2a of the base metal 2. As shown in FIG. As shown in FIG. 3, the plate body 12 is formed of a steel plate having a thickness of about 1 mm, for example, and has an outer diameter φ2 shown in FIG. It is formed in a circular ring shape having a center hole 12a with an inner diameter φ4 larger than the inner diameter φ3 of the mounting hole 4 by a predetermined dimension at the center position.

At this time, the inner edge portion of the center hole 12a abuts against the bush cutter mounting surface (back surface of the mounting flat portion 2a) on the outer peripheral side of the mounting flat portion 2a of the base metal 2, and the rivet hole 12b ( 3) are formed at equal intervals along the circumference, for example, six. The plate 12 is integrally secured to the flat mounting portion 2a with rivets 13 using the rivet holes 12b and rivet holes (not shown) provided in the flat mounting portion 2a.

As a result, as shown in FIG. 2, the plate body 12 is arranged parallel to and opposed to the blade tip flat portion 2c via a space S formed by a gap corresponding to the height dimension h1 of the stepped portion 2b of the base metal 2. 2, the plate body 12 covers substantially the entire area of the outer peripheral edge of the cutting edge flat portion 2c of the base metal 2 except for the chip 6 portion from the lower side of FIG. The inner diameter φ4 of the center hole 12a of the plate 12 is set slightly larger than the outer diameter of the receiving flange 5a of the bush cutter 5, which will be described later. It is set to a predetermined value according to the outer diameter of the base metal 2 and the like.

Manufacture of the tipped saw 1 configured in this way is first performed by drawing a base metal material (a raw material such as a carbon steel plate) by press drawing, and forming the mounting flat portion 2a having the mounting hole 4 and the stepped portion 2b. Then, the blade chamber 9, the chip fixing portion 10, and the blade edge flat portion 2c having the lightening hole 3 are formed. At the time of this drawing process, the radius of the cutting edge flat portion 2c side and the mounting flat portion 2a side of the recessed portion 8 (stepped portion 2b) are set to a predetermined value according to the outer diameter of the mounting flat portion 2a and the inner diameter of the recessed portion 8. By setting this, cracking or the like of the recessed portion 8 can be prevented, and swinging and tilting of the base metal 2 during rotation can be suppressed.

After processing the base metal material to produce the base metal 2, the base metal 2 is quenched and annealed using, for example, high-frequency induction heating. During this heat treatment, the base metal 2 is heated and pressurized to prevent warping of the mounting flat portion 2a and the cutting edge flat portion 2c, thereby forming the mounting flat portion 2a and the cutting edge flat portion 2c parallel to each other. . After the heat treatment of the base metal 2 is completed, the surface of the base metal 2 is treated by, for example, shot blasting, or the chips 6 are brazed and fixed to the respective chip fixing portions 10 of the base metal 2 by using, for example, high-frequency induction heating. do.

After that, each surface of the chip 6 is polished and finished, whereby the base metal 2 is manufactured. are fixed with rivets 13, the tipped saw 1 in which the plate 12 is firmly integrated with the base metal 2 is manufactured.

As shown in FIG. 4, the tipped saw 1 constructed in this way has a receiving flange 5a at the tip of a working rod 5c as a rotation transmission shaft of the bush cutter 5, a pressing flange 5b, a mounting bolt 14, a bolt protection cover 15, and the like. attached through the At the time of this mounting, by bringing the lower surface of the receiving flange 5a into contact with the surface of the mounting flat portion 2a of the chipped saw 1 (brush cutter mounting surface 7), the receiving flange 5a and the tip of the working rod 5c are inserted into the recessed portion 8 of the chipped saw 1. etc. are accommodated and arranged. At the same time, the head of the mounting bolt 14, which is located on the back side of the plate 12 with its head protruding, is protected by the bolt protection cover 15. As shown in FIG.

As described above, the outer diameter of the mounting flat portion 2a of the chipped saw 1 and the inner diameter of the center hole 12a of the plate 12 are set larger than the outer diameter of the receiving flange 5a of the bush cutter 5 by a predetermined dimension. The bush cutter mounting surface 7 of the flat portion 2a is in close contact with the entire flange surface of the receiving flange 5a. When the bush cutter 5 is operated in this mounted state, the tipped saw 1 rotates in the direction of arrow B in FIG.

In addition, since the plate 12 also rotates integrally with the base metal 2 during this weeding operation, the tips 6 located outside and above the plate 12 are in contact with the ground while the tip of the plate 12 and the like are in contact with the ground. Plants and the like are mowed and the chips 6 are prevented from coming into direct contact with the ground. As a result, the chip 6 hardly scatters scattered objects such as pebbles, sand, and mud on the ground. The flying object is bounced back toward the ground on the back surface of the base metal 2, and scattering toward the front side of the base metal 2, that is, toward the operator is reliably suppressed.

As described above, according to the tipped saw 1, the outer diameter φ2 of the mounting hole 4 is located on the side opposite to the mounting surface of the bush cutter, which is the back side of the base metal 2, and the outside diameter φ2 is a predetermined size larger than the outer diameter Since the substantially annular plate body 12 having a small dimension t and a gap-like space S between itself and the surface of the base metal 2 is integrally arranged, the tip located on the outermost side of the base metal 2 is A circular plate 12 having an outer diameter smaller than the base metal 2 is positioned on the ground side of the base 6, and the plate 12 comes into contact with the ground before the tip 6 (the base metal 2) during the mowing operation. It is possible to greatly suppress the scattering of debris on the ground due to

In particular, by setting the outer diameter φ1 of the base metal 2 and the outer diameter φ2 of the scattering prevention plate 12 to predetermined values, the cutting height of plants, etc. is slightly increased according to the height dimension h1, but cutting by the tip 6 is possible. It is possible to obtain a chipped saw that provides good brush cutting performance without deteriorating performance and that can reliably suppress scattering of flying objects, for example, in the direction of the operator, and has unprecedented safety. In addition, since contact of the tip 6 with the ground is suppressed during mowing work, breakage of the tip 6 itself is suppressed, and the life of the tipped saw 1 can be extended as compared with a conventional tipped saw.

Furthermore, since the plate body 12 and the blade tip flat portion 2c of the base metal 2 are arranged in parallel to face each other, and a space S having a height dimension h1 is formed between them, the grasses and trees that have been mowed, etc. can be discharged out of the space S by the centrifugal force when the tipped saw 1 rotates, and the scattered matter remaining in the space S after the tipped saw 1 is stopped can be easily removed.

In addition, since the blade edge flat portion 2c of the base metal 2, which affects the cutting performance, is set parallel to the attachment flat portion 2a, the tip 6 as the blade edge and the attachment flat portion 2a are at an angle so that the tip 6 can be cut against plants and the like. It is possible to prevent oblique entry, for example, the tip 6 can be inserted into plants or the like at a substantially right angle, and the tipped saw 1 can be easily secured with good sharpness.

Furthermore, since the tip of the working rod 5c of the bush cutter 5 is housed in the recess 8 of the base metal 2, the tip 6 is prevented from being unnecessarily far from the bush cutter. While the plate 12 is in contact with the ground, the tip 6 can be reliably brought into contact with the predetermined position on the root side of the plant, etc., and the weeding work can be smoothly performed.

In the above-described embodiment, the plate 12 is formed of a steel plate having a circular outer shape. Since the weight increases, it is preferable to take various measures to reduce the weight of the plate 12 . As a countermeasure for weight reduction, light weight plates such as aluminum or stainless steel, or plates made of hard resin are used instead of the steel plates, or the plate thickness of these various plates is reduced as much as possible. be able to. It is also possible to cope with this problem by forming lightening holes having an appropriate shape in the plate 12. In this case, it is preferable to provide relatively large lightening holes as far as possible on the inner peripheral side of the plate (the side farther from the tip 6). .

In the above-described embodiment, the plate body 12 has a flat plate shape and the tip is set parallel to the blade edge flat portion 2c of the base metal 2. However, for example, the portion of the plate body 12 facing the blade edge flat portion may By forming a convexly warped curved surface, the projecting portion of the plate 12 can be brought into contact with the ground during weeding work, and the work itself may be performed smoothly. Furthermore, in the above-described embodiment, the plate 12 is integrally fixed to the base metal 2, but the plate 12 may be integrally arranged on the outer peripheral edge of the bolt protection cover 15, for example. The body 12 can be removed from the base metal 2 by removing the bolt protection cover 15 .

In the above-described embodiment, the size of the clearance between the blade edge flat portion 2c of the base metal 2 and the plate body 12 (height dimension h1 of the stepped portion 2b), the dimensional relationship between the base metal 2 and the plate body 12, the fixing structure thereof, and the like are examples. And, for example, welding is used as a fixing structure, and an appropriate structure can be adopted without departing from the gist of each invention of the present invention.

The present invention is not limited to chipped saws having a flat mounting portion and a flat cutting edge portion, etc., but can be applied to all tipped saws for weeding, which have various types of base metals and are used for mowing plants and the like. .

DESCRIPTION OF SYMBOLS 1... Tipped saw for cutting grass, 2... Base metal, 2a... Mounting flat part, 2b... Stepped part, 2c... Cutting edge flat part, 4... Mounting hole, 5... Bush cutter 6 Chip 7 Mounting surface for brush cutter 8 Recess 9 Blade chamber 10 Tip fixing portion 12 Plate 12a・Center hole 12b...Rivet hole 13...Rivet 14...Mounting bolt 15...Bolt protection cover h1...Height dimension of stepped part φ1...Base metal Outer diameter, φ2: Outer diameter of plate, S: Space.

Claims (3)

A tipped saw for brush cutting in which a number of tip fixing portions are formed on the outer peripheral edge of a disk-shaped base metal, and tips are fixed to the tip fixing portions, respectively, and the brush cutter is attached to a brush cutter mounting surface ,
The base metal has a mounting flat portion in which a bush cutter mounting hole is formed, and an outer peripheral side of the mounting flat portion that protrudes in an inclined state toward the brush cutter side and has a circular shape on the brush cutter mounting surface side. a stepped portion forming a substantially dish-shaped recessed portion;
On the side of the base metal opposite to the mounting surface of the brush cutter and on the outer peripheral side of the bush cutter mounting hole with a predetermined dimension, the outer diameter is smaller than the outer diameter of the base metal by a predetermined dimension, at least between the base metal and the base metal at the tip side thereof. A tipped saw for brush cutting, characterized in that a circular plate having a predetermined gap and having a flat outer peripheral surface is integrally arranged. A brush cutter in which a large number of tip fixing portions are formed on the outer peripheral edge of a disk-shaped base metal, and chips are respectively fixed to the tip fixing portions, and the brush cutter is attached to the brush cutter mounting surface via mounting bolts. In tipped saws for
The base metal has a mounting flat portion in which a bush cutter mounting hole is formed, and an outer peripheral side of the mounting flat portion that protrudes in an inclined state toward the brush cutter side and has a circular shape on the brush cutter mounting surface side. a stepped portion forming a substantially dish-shaped recessed portion;
The outer diameter of the bolt protection cover for protecting the head of the mounting bolt is smaller than the outer diameter of the base metal by a predetermined dimension, and at least on the tip end side thereof, there is a predetermined gap between the cover and the base metal. 1. A tip saw for weeding , characterized in that a circular plate having a flat outer peripheral surface is integrally arranged . 3. The tipped saw for cutting brushes according to claim 1, wherein said plate body is made lighter by means of its material, thickness or formation of lightening holes.

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